LONDON — OPEC said Tuesday it considers crude supplies to be “abundant” and that an expected slowdown in oil demand growth next year may be more severe than forecast if the global economy deteriorates.

The Organization of Petroleum Exporting Countries predicts that the increase in world oil consumption will decline to 800,000 barrels a day in 2013, from 900,000 a day this year, according to its monthly market report released Tuesday. The group estimates its 12 members will need to pump an average of 29.5 million barrels a day next year, or 1.9 million less than current output levels.

“Downside risk exists as the economic slowdown in the developed countries could increasingly spill over (into emerging economies),” the group’s Vienna-based secretariat said. “Crude-oil stocks remain at comfortable levels.”

Brent crude futures have lost 11 percent from this year’s peak amid concern that Europe’s continued sovereign debt crisis will damage the global economy and restrain fuel use. Even after the drop, current prices are not justified by supply and demand levels, Saudi Arabian Oil Minister Ali al-Naimi said Monday. Global economic growth will decelerate to 3.2 percent in 2013, from 3.3 percent this year, according to OPEC.

World oil demand will increase 0.9 percent, to 89.55 million barrels a day, in 2013, according to OPEC. That compares with growth of 1 percent, to 88.74 million a day, anticipated for this year.

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